JP2005159065A - 六方晶フェライト微粒子分散流体とその製造方法 - Google Patents
六方晶フェライト微粒子分散流体とその製造方法 Download PDFInfo
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Abstract
【解決手段】これまで通常加熱では数時間から数日を要していた製造工程を、マイクロ波照射加熱を用いることによって数分から1時間以内にまで短縮した。また、水を溶媒として用いる従来の水熱法では、製品フェライト粒子が1ミクロンメートル以上であったが、溶媒系を水−水不溶性の媒体油−界面活性剤とすることにより、ナノメートルサイズのフェライト微粒子が媒体油中に均一分散した流体フェライトが得られることを見出した。
【選択図】なし
Description
なお、原料調製のための金属塩水溶液、媒体油、界面活性剤あるいは塩基に関し、それらの添加混合の順番は本発明においては特に制約はなく任意である。
以下、本発明の効果を、実施例によって更に詳しく説明する。
実施例1と同一条件で、デカンのみを使用せず、さらに水20mlを加えた条件で反応を行った。反応後の生成物をビーカーに移したところ、透明な水相の下部に褐色のフェライト粒子が沈積した。
実施例1と同一条件で、界面活性剤を添加しない場合、あるいはデカンと界面活性剤両方を添加しない場合についても実験した結果、全て褐色のフェライト粒子が底部に沈積するのみで、均一に分散した流体は得られなかった。更に、親水性の界面活性剤についても同一条件で実験したが、流体フェライトは生成しなかった。
塩基としてNaOHの替わりに25%アンモニア水5mlを使用した以外は、実施例1と同一条件で反応を行った。冷却後の反応物をビーカーに移し、静置したが、流体Baフェライトの生成は認められなかった。
マイクロ波加熱によって反応温度を175℃とした以外は、実施例1と同一条件で反応を行った。冷却後の反応物をビーカーに移し、静置したが、流体Baフェライトの生成は認められなかった。
Claims (1)
- 六方晶フェライト微粒子製造用水溶性原料化合物、水、水不溶性の媒体油および界面活性剤よりなる混合物に強塩基を添加した後、マイクロ波を照射することにより該混合物の温度を180℃よりも高くすることにより得られる媒体油中に安定分散した六方晶フェライト微粒子分散流体とその製造方法。
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JP2003396652A JP4385216B2 (ja) | 2003-11-27 | 2003-11-27 | 六方晶フェライト微粒子分散流体の製造方法 |
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JP2003396652A JP4385216B2 (ja) | 2003-11-27 | 2003-11-27 | 六方晶フェライト微粒子分散流体の製造方法 |
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JP2005159065A true JP2005159065A (ja) | 2005-06-16 |
JP4385216B2 JP4385216B2 (ja) | 2009-12-16 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104064305A (zh) * | 2013-03-21 | 2014-09-24 | 国家纳米科学中心 | 一种制备水溶性磁性纳米粒子的方法 |
WO2015053234A1 (ja) * | 2013-10-07 | 2015-04-16 | 第一高周波工業株式会社 | 強磁性体微粒子製造装置 |
JPWO2017125981A1 (ja) * | 2016-01-20 | 2018-11-15 | ソニー株式会社 | 磁気記録媒体 |
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2003
- 2003-11-27 JP JP2003396652A patent/JP4385216B2/ja not_active Expired - Fee Related
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104064305A (zh) * | 2013-03-21 | 2014-09-24 | 国家纳米科学中心 | 一种制备水溶性磁性纳米粒子的方法 |
WO2015053234A1 (ja) * | 2013-10-07 | 2015-04-16 | 第一高周波工業株式会社 | 強磁性体微粒子製造装置 |
JP5909594B2 (ja) * | 2013-10-07 | 2016-04-26 | 第一高周波工業株式会社 | 強磁性体微粒子製造装置 |
US10661247B2 (en) | 2013-10-07 | 2020-05-26 | Dai-Ichi High Frequeny Co., Ltd. | Ferromagnetic-particle manufacturing apparatus |
US10661248B2 (en) | 2013-10-07 | 2020-05-26 | Dai-Ichi High Frequency Co., Ltd. | Ferromagnetic-particle manufacturing apparatus |
JPWO2017125981A1 (ja) * | 2016-01-20 | 2018-11-15 | ソニー株式会社 | 磁気記録媒体 |
JP7073718B2 (ja) | 2016-01-20 | 2022-05-24 | ソニーグループ株式会社 | 磁気記録媒体 |
US11355145B2 (en) | 2016-01-20 | 2022-06-07 | Sony Corporation | Magnetic recording medium |
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